1. Femtosecond, two-photon, laser-induced fluorescence (TP-LIF) measurement of CO in high-pressure flames
- Author
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Karna S. Patel, Zhili Zhang, K. Arafat Rahman, Yue Wu, Mikhail N. Slipchenko, Terrence R. Meyer, James R. Gord, and Sukesh Roy
- Subjects
Materials science ,business.industry ,Analytical chemistry ,02 engineering and technology ,Rotational–vibrational spectroscopy ,021001 nanoscience & nanotechnology ,Mole fraction ,01 natural sciences ,Fluorescence ,Atomic and Molecular Physics, and Optics ,010309 optics ,symbols.namesake ,Optics ,Two-photon excitation microscopy ,0103 physical sciences ,Femtosecond ,symbols ,Electrical and Electronic Engineering ,0210 nano-technology ,business ,Laser-induced fluorescence ,Engineering (miscellaneous) ,Raman scattering ,Excitation - Abstract
Quantitative, kiloherz-rate measurement of carbon monoxide mole fractions by femtosecond two-photon, laser-induced fluorescence (TP-LIF) was demonstrated in high-pressure, luminous flames over a range of fuel-air ratios. Femtosecond excitation at 230.1 nm was used to pump CO two-photon rovibrational X1Σ+→B1Σ+ transitions in the Hopfield–Birge system and avoid photolytic interferences with excitation irradiance ∼1.7×1010 W/cm2. The effects of excitation wavelength, detection scheme, and potential sources of de-excitation were also assessed to optimize the signal-to-background and signal-to-noise ratios and achieve excellent agreement with theoretically predicted CO mole fractions at low and high pressure.
- Published
- 2018